Hyper-V enables running virtualized computer systems on top of a physical host. These virtualized systems (aka: guests) can be used and managed just as if they were physical computer systems, however they exist in a virtualized and isolated environment.
If you like, you can delete a Hyper-V virtual machine to remove it from the Hyper-V Manager.
When you delete a Hyper-V virtual machine, it deletes the virtual machine’s configuration file, but does not delete any virtual hard drives. If the virtual machine has any checkpoints, these are deleted and merged into the virtual hard disk files after the virtual machine is deleted.
This tutorial will show you how to delete a Hyper-V virtual machine on your Windows 10 PC.